Synthesis, C–H bond functionalisation and cycloadditions of 6-styryl-1,2-oxathiine 2,2-dioxides
作者:Christopher D. Gabbutt、B. Mark Heron、Thomas Lilly、Ochola W. Ogwang、Dimitrios Zonidis
DOI:10.1039/d1ob01125a
日期:——
of a complementary bromination – Suzuki cross-coupling sequence. Whilst the cycloaddition of benzyne, derived from in situ fluoride initiated decomposition of 2-(trimethylsilyl)phenyl trifluoromethanesulfonate, to the substituted 1,2-oxathiine 2,2-dioxides resulted in low yields of substituted naphthalenes, the addition of 4-phenyl-1,2,4-triazoline-3,5-dione to the 6-styryl-1,2-oxathiine 2,2-dioxides
一系列 6-styryl-1,2-oxathiine 2,2-dioxides 通过两步方案从现成的 (1 E ,4 E )-1-(二甲基氨基)-5-arylpenta-1 中有效地获得, 4-dien-3-ones 涉及区域选择性亚砜加成和随后的 Cope 消除。Pd 介导的 6-styryl-1,2-oxathiine 2,2-二氧化物的直接 C-H 键官能化和更广泛的 5,6-二芳基取代的 1,2-oxathiine 2,2-二氧化物的选择进展顺利,得到C-3(杂)芳基取代的类似物,其结果与互补溴化 - Suzuki 交叉偶联序列的结果形成对比。而苯的环加成,原位衍生氟化物引发的 2-(三甲基甲硅烷基)苯基三氟甲磺酸盐分解为取代的 1,2-氧噻吩 2,2-二氧化物导致取代萘的收率低,添加 4-苯基-1,2,4-三唑啉-3, 5-二酮到 6-styryl-1,2-oxathiine 2