Stereocontrolled [4+2]-Annulation Accessing Dihydropyrans: Synthesis of the C1a-C10 Fragment of Kendomycin
作者:Jason T. Lowe、James S. Panek
DOI:10.1021/ol0501875
日期:2005.4.14
[reaction: see text] Development of new organosilane reagents bearing C-centered chirality where the stereocenter is fully substituted, and their use in the stereocontrolled synthesis of cis- and trans-dihydropyrans containing a trisubstituted olefin is described. The reagents participate in Lewis acid promoted [4+2]-annulations providing useful levels of selectivity with both aliphatic and aromatic
[反应:见正文]描述了新型的具有C中心手性的有机硅烷试剂的开发,其中立体中心被完全取代,并描述了它们在立体控制合成含三取代烯烃的顺式和反式二氢吡喃中的用途。该试剂参与路易斯酸促进的[4 + 2]环空反应,提供与脂族和芳族醛的有用选择性。还描述了立体霉素(1)的C1a-C10片段的立体选择性合成。