在氢化钠的存在下,异硫氰酸苯基酯与γ-氯乙酰乙酸乙酯反应,生成2-苯胺基-4-氧代-4,5-二氢噻吩-3-羧酸乙酯(1b)。化合物(1b)表示酮亚甲基化合物的典型反应。用Vilsmeier试剂和三氯氧化磷得到氯甲酰噻吩(10)。从(1b)与亚硫酰氯获得可能的硫衍生物(11)。进一步利用氯甲酰基噻吩(10)可得到正常的芳族醛缩合产物,并与巯基乙酸酯一起生成噻吩并[3,2- b ]噻吩(25)。
Oxindole was found to react readily with thionyl chloride to give (in an excellent yield) the isolable sulfine (13a), which on heating (refluxing acetonitrile) gave isoindigo (15a). The dark violet 3‐sulfinato‐oxindole (13a) readily reacted with 2,3‐dimethylbutadiene to give a colorless cyclo‐adduct (14a). The sulfine also reacted readily with various nucleophilic reagents, thus, thioloacetic acid
Synthesis of α-oxo sulphines from some dihydrothiophense and thionyl chloride. Ascertainment of their structure using the cycloadducts with 2,3-dimethylbuta-1,3diene
作者:Bode G. Lenz、R. Curtis Haltlwanger、Binne Zwanenburg
DOI:10.1039/c39840000502
日期:——
A reinvestigation of the reaction of the dihydrothiophenes (1a,b) with thionylchloride confirmed that the sulphines (2) are the products obtained, the structure of (2a) being ascertained by X-ray diffraction analysis of its Diels–Alder adduct (3a): the same reaction on dihydrothiophene (6) produced the corresponding sulphine (7)