Tosylate 1, which features the vitamin D triene unit, was stereoselectively synthesized from commercially available starting materials. This key intermediate undergoes a very efficient one-pot, two-step reaction with tetrabutyl ammonium fluoride to afford vitamin D analogue 2, which bears a cyclic side chain. Reaction of 1 with lithium aluminium hydride and removal of the silyl protecting groups affords
                                    甲苯磺酸酯1(具有
维生素D
三烯单元)是从市售原料中立体选择性合成的。该关键中间体与
四丁基氟化铵进行非常有效的一锅两步反应,得到带有环状侧链的
维生素D类似物2。1与
氢化铝锂反应并除去甲
硅烷基保护基,得到22甲基化的
维生素D类似物3。