for the synthesis of tetrahydropyrans. However, it has been known that stereochemical outcome of IOCC depends on the local structure of substrates and sometimes requires harsh reaction conditions and/or prolonged reaction times for selective formation of 2,6-cis-substituted tetrahydropyrans. These shortcomings limit the feasibility of IOCC in the context of complex natural product synthesis. In this
Enantioselective Diels-Alder Reactions: Effect of the Achiral Template on Reactivity and Selectivity
作者:Mukund Sibi、Jianxie Chen、Levi Stanley
DOI:10.1055/s-2007-968014
日期:2007.2
Several achiral templates have been evaluated in chiral Lewis acid mediated enantioselective Diels-Alder reactions. Templates such as pyrrolidinones and pyrazolidinones that are capable of forming six-membered chelates with the Lewis acid exhibited the best reactivity and highest selectivity.
Crotylations of α-Carbonyl Radicals with Crotylstannane
作者:Mukund P. Sibi、Hideto Miyabe
DOI:10.1021/ol026510a
日期:2002.10.1
[GRAPHICS]Electrophilic radicals undergo crotylation with crotylstannane with moderate to good efficiency. The reaction provides the syn isomer as the major product. The present methodology is complementary to Claisen protocols for the synthesis of gamma,delta-unsaturated carboxylic acid derivatives. Details of the new radical methodology are presented.
Synthesis of some N-acylbenzoxazolinones
作者:N. A. Aliev、S. N. Ivanova、N. N. Mel'nikov、N. I. Shvetsov-Shilovskii
DOI:10.1007/bf00945359
日期:——
Reaction of some amines with unsaturated N-acylbenzoxazolones
作者:N. A. Aliev、R. Razakov、N. D. Abdullaev、Ch. Sh. Kadyrov