Enantioselective Intramolecular [2 + 2 + 2] Cycloaddition of Enediynes for the Synthesis of Chiral Cyclohexa-1,3-dienes
作者:Takanori Shibata、Hiroshi Kurokawa、Kazumasa Kanda
DOI:10.1021/jo070762d
日期:2007.8.1
The enantioselective intramolecular [2 + 2 + 2] cycloaddition of various enediynes, where two acetylenic moieties are connected by a trans-olefinic moiety, gave chiral tricyclic cyclohexa-1,3-dienes using Rh-H8-BINAP catalyst. In the case of carbon-atom-tethered enediynes, enantioselectivity was generally good-to-high regardless of the substituents on their alkyne termini. In contrast, with heteroatom-tethered
Enantioselective Syntheses of Tremulenediol A and Tremulenolide A
作者:Brandon L. Ashfeld、Stephen F. Martin
DOI:10.1021/ol051945u
日期:2005.9.1
[reaction: see text] An enantioselective entry to the skeleton of the tremulane sesquiterpenes is described. The approach features a series of efficient transition metal-catalyzed reactions commencing with an enantioselective rhodium(II)-catalyzed intramolecular cyclopropanation followed by a regioselective allylic alkylation and a diastereoselective rhodium(I)-catalyzed [5 + 2] cycloaddition. This
Enantioselective syntheses of tremulenediol A and tremulenolide A
作者:Brandon L. Ashfeld、Stephen F. Martin
DOI:10.1016/j.tet.2006.05.087
日期:2006.11
A and tremulenolide A. The approach features a series of efficient transition metal-catalyzed reactions commencing with an enantioselective rhodium(II)-catalyzed intramolecular cyclopropanation followed by a regioselective allylic alkylation and a diastereoselective rhodium(I)-catalyzed [5+2] cycloaddition.