Palladium(0)-Catalyzed Enantioselective <i>O</i>,<i>S</i>-Rearrangement of Racemic <i>O</i>-Allylic Thiocarbamates: A New Entry to Enantioenriched Allylic Sulfur Compounds
作者:Hans-Joachim Gais、Achim Böhme
DOI:10.1021/jo010668b
日期:2002.2.1
operation from the corresponding N-methyl S-allylic thiocarbamate through a palladium(0)-catalyzed substitution of iodobenzene in the presence of a base. The palladium(0)-catalyzed enantioselective rearrangement of O-allylic carbamates to S-allylic carbamates has been extended from the solution phase to the solid phase by using a methyl thioisocyanate polystyrene resin. In the case investigated the enantioselectivity
(+/-)-(E)-戊-3-烯-2-醇,(+/-)-(E)-庚-4-烯-3-醇,(+/-)-(E )-2,6-二甲基庚-4-烯-3-醇,(+/-)-环己-2-烯-1-醇和(+/-)-环庚-2-烯-1-醇与甲基异硫氰酸乙基,正丙基,异丙基,正丁基,叔丁基和苄基异氰酸酯以中等收率得到相应的外消旋O-烯丙基硫代氨基甲酸酯,具有良好的热稳定性。(+/-)-(E)-pent-3-en-2-ol-,(+/-)-(E)-hept-4-en-3-ol的钯(0)催化重排使用Pd2在室温下于室温下将-,(+/-)-环己-2-烯-1-醇和(+/-)-环庚-2-烯-1-醇衍生的O-烯丙基硫代氨基甲酸酯(dba)3 * CHCl3(dba =二亚苄基丙酮)作前催化剂和(+)-(1R,2R)-1,2-双-N-((2-(二苯基膦基)苯甲酰基)-1,定量进行2-二氨基环己烷作为钯原子的配体,得到相应的无环(R)构型的S-