A new vinylsilane substitution reaction with glyoxylate: asymmetric synthesis of .alpha.-hydroxy .beta.,.gamma.-unsaturated esters
摘要:
The vinylsilane substitution reaction with glyoxylate and the asymmetric version thereof are described. These new reactions provide alpha-hydroxy beta, gamma-unsaturated esters of biological and synthetic importance in high enantiomeric and geometric purity.
One-Pot Synthesis of α-Trimethylsilyl Enones from Vinylsilanes
作者:Waldemar Adam、Markus J. Richter
DOI:10.1055/s-1994-25433
日期:——
Photooxygenation of vinylsilanes in the presence of acetic anhydride and pyridine afforded α-trimethylsilyl enones 1 in moderate to good yields. Since the required starting materials are readily available, the present approach constitutes a useful alternative to existing methods for the preparation of α-trimethylsilyl enones 1.
Conversion of some alkenyltrimethylsilanes into silyl enol ethers
作者:Robert F. Cunico
DOI:10.1016/s0022-328x(00)85675-2
日期:1981.6
The cycloaddition products (5-trimethylsilylisoxazolines) between alkenyltrimethylsilanes and acetonitrile oxide undergo thermolytic rearrangement-cycloreversion to afford silyl enol ethers of retained stereochemistry vs. the starting alkenylsilanes.
On the origin of geminal regioselectivity in the ene reaction of singlet oxygen with substituted alkenes
作者:Waldemar Adam、Markus J. Richter
DOI:10.1016/s0040-4039(00)61349-7
日期:1993.1
The geminal regioselectivity observed in the ene reaction between singletoxygen and alkenes with anion-stabilizing groups is rationalized on the basis of a perepoxide intermediate, in which in analogy to the nucleophilic attack on protonated epoxides, the perepoxide is opened preferentially at the CO bond weakened by the substituent.