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Table <strong>of</strong> Contents XIII<br />

17.1.1.2.4.1.3.3 Method 3: Reactions Involving Dealkylation at the Ring Sulfur ........... 46<br />

17.1.1.2.4.1.4 Of Heteroatoms ........................................................... 46<br />

17.1.1.2.4.1.4.1 Method 1: Replacement <strong>of</strong> Heteroatoms on an Annulated Ring Carbon .. 46<br />

17.1.1.2.4.1.4.2 Method 2: Removal <strong>of</strong> Oxygen from the Ring Sulfur or from an Annulated<br />

Ring Nitrogen .............................................. 47<br />

17.1.1.2.4.2 Addition Reactions ........................................................ 48<br />

17.1.1.2.4.2.1 Method 1: Reactions <strong>of</strong> Phenoxathiins with Alkylating Reagents ......... 48<br />

17.1.1.2.4.2.2 Method 2: Reactions Involving Phenoxathiin Cation Radical ............. 49<br />

17.1.1.2.4.2.3 Method 3: Oxidation <strong>of</strong> a Ring Sulfur .................................. 49<br />

17.1.1.2.4.3 Rearrangement <strong>of</strong> Substituents ............................................ 50<br />

17.1.1.2.4.3.1 Method 1: Reactions Involving Benzyne ................................ 50<br />

17.1.1.2.4.4 Modification <strong>of</strong> Substituents ............................................... 51<br />

17.1.1.2.4.4.1 Method 1: Reactions Involving Acyl Groups ............................ 51<br />

17.1.2 Product Subclass 2: One Oxygen and One Nitrogen or Phosphorus Atom<br />

H. Ulrich<br />

17.1.2 Product Subclass 2: One Oxygen and One Nitrogen or Phosphorus Atom . 55<br />

17.1.2.1 1,4-Oxazines ............................................................... 55<br />

17.1.2.1.1 Synthesis by Ring-Closure Reactions ........................................ 55<br />

17.1.2.1.1.1 By Formation <strong>of</strong> One O—C and One N—C Bond .............................. 55<br />

17.1.2.1.1.1.1 Method 1: From N-Phenacylideneaniline ............................... 55<br />

17.1.2.1.1.2 By Formation <strong>of</strong> One O—C Bond ............................................ 56<br />

17.1.2.1.1.2.1 Method 1: From N,N-Diphenacylaniline ................................ 56<br />

17.1.2.1.1.2.2 Method 2: From a-Aminocarboxylic Acid Derivatives ................... 56<br />

17.1.2.1.1.3 By Formation <strong>of</strong> One N—C Bond ............................................ 57<br />

17.1.2.1.1.3.1 Method 1: From Bis(b-oxoethyl) Ethers and Related Compounds ........ 57<br />

17.1.2.1.2 Synthesis by Ring Transformation ........................................... 58<br />

17.1.2.1.2.1 Method 1: From 1,4-Dioxanes ......................................... 58<br />

17.1.2.2 1,4-Benzoxazines .......................................................... 58<br />

17.1.2.2.1 Synthesis by Ring-Closure Reactions ........................................ 59<br />

17.1.2.2.1.1 By Formation <strong>of</strong> One O—C and One N—C Bond .............................. 59<br />

17.1.2.2.1.1.1 Method 1: From Sulfinylamines and Ynamines ......................... 59<br />

17.1.2.2.1.1.2 Method 2: From Benzo-1,2-quinone Imines and Ynamines .............. 60<br />

17.1.2.2.1.1.3 Method 3: From Aminophenols and a-Carbonyl Compounds ............ 61<br />

17.1.2.2.1.1.3.1 Variation 1: From a-Halo Esters ......................................... 61<br />

17.1.2.2.1.1.3.2 Variation 2: From a-Halo Ketones ...................................... 62<br />

17.1.2.2.1.1.3.3 Variation 3: From Maleic Anhydride ..................................... 63<br />

17.1.2.2.1.1.3.4 Variation 4: From Ynones, Dimethyl 3-Methoxy-2-oxobutane-1,4-dioate, or<br />

Ethyl Ethoxy(imino)acetate ................................. 63<br />

17.1.2.2.1.1.3.5 Variation 5: From a-Carbonyl Compounds .............................. 64

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