Oxidant controlled regio- and stereodivergent azidohydroxylation of alkenes via I<sub>2</sub> catalysis
作者:P. K. Prasad、R. N. Reddi、A. Sudalai
DOI:10.1039/c5cc02374b
日期:——
A novel, I2 catalyzed regio- and stereodivergent vicinal azidohydroxylation of alkenes leading to 1,2-azidoalcohols in high yields (up to 92%) and excellent dr (up to 98%) has been developed.
Highly regioselective ring opening of epoxides using NaN3: a short and efficient synthesis of (−)-cytoxazone
作者:Joshodeep Boruwa、Jagat C. Borah、Biswajit Kalita、Nabin C. Barua
DOI:10.1016/j.tetlet.2004.07.157
日期:2004.9
A convenient and efficient synthesis of 1,2-azido alcohols has been achieved by regioselective ring opening of epoxides using NaN3 and 4 Å molecular sieves in acetonitrile. The utility of this method has been demonstrated by achieving a shortsynthesis of (−)-cytoxazone in 48% overall yield.
Synthesis of 2-Oxazolidinones from β-Lactams: Stereospecific Total Synthesis of (−)-Cytoxazone and All of Its Stereoisomers
作者:Rajesh Kumar Mishra、Cristina M. Coates、Kevin D. Revell、Edward Turos
DOI:10.1021/ol062752p
日期:2007.2.1
2-oxazolidinones are prepared in stereomerically pure form from 3-hydroxy beta-lactams by a ring-opening-cyclization isomerization process. Application of this methodology to the total synthesis of the cytokinemodulator, (-)-cytoxazone, and its three stereoisomers is demonstrated. [reaction: see text].
Short synthesis of both enantiomers of cytoxazone using the Petasis reaction
作者:Shigeo Sugiyama、Satoshi Arai、Keitaro Ishii
DOI:10.1016/j.tetasy.2004.08.004
日期:2004.10
Both enantiomers of cytoxazone, (−)-1 and (+)-1, were synthesized using the Petasis reaction of dl-glyceraldehyde 2, 4-methoxyphenylboronic acid 3 and (R)-1-(1-naphthyl)ethylamine 7, following formation of an oxazolidin-2-one ring.