Photoaddition Reactions of Benzoxazole-2(3H)-thiones to Cycloalkenes and Heteroaromatics
作者:Takehiko Nishio、Kiyoko Shiwa、Masami Sakamoto
DOI:10.1002/hlca.200390266
日期:2003.10
cyclohexa-1,4-diene (2d), and indene (2e) yielded 2-substituted benzoxazoles 4–13, 18 and 19, and iminothietanes 14–17, by intramolecular trapping of the acyl or MeOCO and PhOCO groups by thiolate anion of the zwitterionic intermediate I and by the phenolate anion of the zwitterionic intermediate II, respectively, derived from the spirocyclic amino-thietanes AT formed by [2+2] cycloaddition of the CS bond of
苯并恶唑-2-硫酮的光加成反应1与环烯烃2和杂芳族化合物3进行了检查。的照射Ñ -acylbenzoxazole -2-硫酮1A和1B,和3-(甲氧羰基) -苯并恶唑-2-和3-(苯氧基羰基)(3 ħ)-thiones(1F和1H。,RESP)在环烯烃的存在2A -图2c,环己-1,4-二烯(2D)和茚(2E),得到2-取代的苯并恶唑4 - 13,18和19,和iminothietanes 14- 17,由两性离子中间体的硫醇盐阴离子的酰基或MeOCO和PhOCO基团的分子内俘获我和由两性离子中间体的酚盐阴离子II,分别从螺环氨基thietanes衍生AT通过形成[2 + 2] 1的CS键和2的CC键的环加成。在杂芳族化合物3的存在下照射1只能得到2-取代的苯并恶唑20 – 33。