Treatment of the para-toluenesulfonyl iodide adducts of a series of 1-substituted 5-hexenols with K[N(TMS)2] gave 2,6-disubstituted tetrahydropyrans with excellent cis-diastereoselectivity. The corresponding pentenols gave the 2,5-disubstituted tetrahydrofurans as 1:1 cis:trans mixtures. © 1997 Elsevier Science Ltd.
                                    用K [N(TMS)2 ]处理一系列1-取代的5-己烯醇的对
甲苯磺酰
碘化物加合物,得到2,6-二取代的
四氢吡喃,具有优异的顺-非对映选择性。相应的
戊烯醇得到2,5-二取代的
四氢呋喃,为1∶1的顺式:反式混合物。©1997爱思唯尔科学有限公司。