Ruthenium Porphyrin Catalyzed Tandem Sulfonium/Ammonium Ylide Formation and [2,3]-Sigmatropic Rearrangement. A Concise Synthesis of (±)-Platynecine
作者:Cong-Ying Zhou、Wing-Yiu Yu、Philip Wai Hong Chan、Chi-Ming Che
DOI:10.1021/jo049540v
日期:2004.10.1
allyl sulfides such as crotyl sulfide produced an equimolar mixture of anti- and syn-2-(ethylthio)-3-methyl-4-pentenoic acid ethyl ester. The analogous “EDA + N,N-dimethylcrotylamine” reaction afforded a mixture of anti- and syn-2-(N,N-dimethylamino)-3-methyl-4-pentenoic acid ethyl esters with a diastereoselectivity of 3:1. The observed catalytic activity of [RuII(TTP)(CO)] for the ylide [2,3]-sigmatropic
内消旋四(对甲苯基)卟啉合钌(II)羰基[Ru II(TTP)(CO)]可在重氮存在下催化重氮化合物(如重氮乙酸乙酯(EDA))的催化分解,从而形成分子间sulf和内铵盐。烯丙基硫化物和胺。观察到[2,3]-σ重排产物的独家形成(70-80%的产率),而未检测到[1,2]-重排产物。EDA与二取代的烯丙基硫化物(如巴豆基硫化物)的Ru催化反应产生了抗-和顺式-2-(乙硫基)-3-甲基-4-戊烯酸乙酯的等摩尔混合物。类似的“ EDA + N,N-二甲基巴豆胺”反应提供了抗和非对映选择性为3:1的顺式-2-(N,N-二甲基氨基)-3-甲基-4-戊烯酸乙酯。观察到的[Ru II(TTP)(CO)]对内酯[2,3]-σ重排的催化活性与报道的涉及[Rh 2(CH 3 CO 2)4 ]和[Cu(acac)的实例相当2 ]作为催化剂。类似地,在[Ru II]下,重氮系到烯丙基硫醚和胺上的重氮基团的分子内