Accoun ts Letters - Thieme Chemistry

Letters
VIII Table of Contents
1274
A Facile Synthesis of 3’-Deoxy-3’-fluorothymidine
via a Highly Stereoselective Glycosylation with 2,3-
Dideoxy-3-fluoro-D-erythro-pentofuranosyl Diethyl
Phosphite
J. Inagaki, H. Sakamoto, M. Nakajima, S. Nakamura,
S. Hashimoto
1277
Polymer-Supported Acid Catalyst in the Carbon-
Carbon Bond Formation of Acetals with Silylated
Nucleophiles
N. Tanaka, Y. Masaki
1280
Treatment of N-Boc Derivatives of b-Amino Alcohols
with N,N-Diethylaminosulfur Trifluoride Leads to
Chiral Oxazolidinones: An Unexpected Intramolecular
Cyclization
H. Zhao, A. Thurkauf
1283
A New and Extremely Active Corey’s Chiral Oxazaborolidine
Catalyst
K. Ishihara, S. Kondo, H. Yamamoto
1286
Sulfur-Controlled Exo Selective Aryl Radical
Cyclization onto Exo-Methylenecycloalkanes
H. Ishibashi, T. Kobayashi, D. Takamasu
1289
A Novel Carbocyclic Ring Closure of Hex-5enopyranosides
and Pent-4-enofuranosides
J. K. Gallos, T. V. Koftis, A. E. Koumbis, V. I. Moutsos
OTMS
O
N
Me
HN
Me
BzO
O
TMSO N
(1.5 equiv.)
BzO
F
OP(OEt)2 TMSOTf (1.0 equiv.)
EtCN, -50 °C, 30 min
α:β=64:36
R OMe
OMe
(50 mg)
NC
NC
O
O
N
O Ot DAST
CH2F Bu
O
O
O
O
polymer cat. (50 mg), TMS-Nu (1.5 eq.)
CH 3CN, reflux
R = aryl, aliphatic, α,β-unsaturated
Nu = CN, CH2COPh, CH2CO-2-Furyl
N
O Ot CH2OH DAST
Bu
SPh PhS
Br
Bu3SnH AIBN
( )n
( ) n
O
O
N
F
β:α=91:9
R OMe
Nu
N O
O