Synthesis of chiral 1- and 2-(p-tolylsulfinyl)-3-trimethylsilyloxybuta-1,3-dienes and their behaviour in Diels–Alder cycloadditions
作者:M.Teresa Aranda、Maria C Aversa、Anna Barattucci、Paola Bonaccorsi、M.Carmen Carreño、M.Belén Cid、José L Garcı́a Ruano
DOI:10.1016/s0957-4166(00)00039-2
日期:2000.3
rearrangement gave the bicyclic α,β-unsaturated ketone 17 (2-methyl-2,3,5,6-tetrahydro-1H-[1,2,4]triazolo[1,2-a]pyridazine-1,3,6-trione). Diels–Alder cycloaddition of enantiopure diene 2 with 10 occurred under pressure leading to a diastereomeric mixture of adducts where the trimethylsilyl enol ether moiety spontaneously evolved to the ketone function. The major enantiopure product 18a [(3aS,6S,7aR,RS
( - (±)的合成ë)-1-(p -tolylsulfinyl)-3- trimethylsilyloxybuta -1,3-二烯1和(小号小号)-2-(p -tolylsulfinyl)-3- trimethylsilyloxybuta -1,3- -二烯2及其与环状亲二烯体的反应进行了描述。二烯的环加成1与Ñ -methylmaleimide 10是得到的复合物的反应混合物的压力下进行从在C-3',(±)2个差向异构体- 11A和(±) - 11b中[甲基-2,3,3a,4,5,分离等量的7a-六氢-2-甲基-7a-(1-甲基琥珀酰亚胺-3-基)-1 H-异吲哚-1,3,5-三酮]。二烯(±)-在大气压和室温下,将1个环加成到反应性更高的4-甲基-1,2,4-三唑啉-3,5-二酮14上。然而,关于这种添加的立体化学结果无话可说,因为通过亚砜-亚磺酸酯重排而失去手性助剂,得到了双环α,β-不饱和酮17(2-甲基-2