synlett 17/2009 - Thieme Chemistry

Letters
X Table of Contents
2831 Y. Yue
H. Yamamoto
M. Yamane*
2836 J. Clayden*
J. Clayton
R. A. Harvey
O. Karlubíková
2839 R. K. Gessner
K. Chibale*
2844 I. González
A. Pla-Quintana
A. Roglans*
Rhodium-Catalyzed Homocoupling of (1-Acyloxyvinyl)silanes: Synthesis of
1,3-Diene-2,3-diyl Diesters and Their Derivatives
OCOR
SiMe3
2
R1 5 mol%
[RhCl(CO)2]2
Cl3CCOCCl3 toluene, 80 °C
OCOR2 R1 OCOR2 R1 R1 = aryl, alkyl R2 = Me, Ph, OEt, etc. 18–92%
R1 R1 MeO OMe
O
R1 = Ph(CH2) 2 R2 K2CO3 MeOH
= Ph 87%
A One-Pot Synthesis of 2-Aryl-4,5-anti-diphenyloxazolines
O
Cl
R
Ph Ph
(S) (R)
HO
NH2
Et 3N (4 equiv),
CH 2Cl 2, 0–25 °C
HO
O
Ph
NH
R
Ph
MeSO 2Cl,
0–25 °C
Ph
O
N
R
Ph
(R) (R)
13 examples
20–90% yield
A New and Simple Synthesis of Sulfonyl Ureas from Sulfonamides and
N-Alkyl-1,2,4-dithiazolidine-3,5-diones
S
S
O
O
NH
Br R 1
NaHCO3, MeCN
20 °C, 16 h
S
S
O
O
N
R 1
O O
H2N S R 2
Ph3P, K2CO3
PhMe, reflux, 24 h
O O
R
S
N
H
2
Rhodium N-Heterocyclic Carbene Complexes as Effective Catalysts for
[2+2+2]-Cycloaddition Reactions
R
N
Cl
N R
Rh
R = i-Pr, Mes
O
N
H
R 1