A novel oxidative cleavage reaction with Pb(OAc)4 via dithioacetal derivatives.
作者:KUNIO HIROI、SHUKO SATO、KAZUHIDE MATSUO
DOI:10.1248/cpb.28.558
日期:——
The oxidative cleavage of 2-alkyl-2-(1-hydroxyalkyl)-1, 3-dithianes (1-5) and 2-(1-hydroxyethyl)-2-methyl-1, 3-dithiolane (11) with Pb (OAc)4 gave 3-alkyl-1, 4-dithiepan-2-ones (7a-e) and 1, 4-dithian-2-one (12), respectively, in fairly good yields. Analogously, the treatment of 2-alkylidene-1, 3-dithianes (13a-e) with Pb (OAc)4 resulted in a ring expansion to give 7a-e, whereas the reaction of 2-benzylidene-1, 3-dithiane (13f) with Pb (OAc)4 did not produce the expected ring expansion product, instead giving 2-(α-acetoxybenzylidene)-1, 3-dithiane (8).
用 Pb (OAc)4氧化裂解 2-烷基-2-(1-羟基烷基)-1, 3-二噻烷(1-5)和 2-(1-羟乙基)-2-甲基-1, 3-二硫环(11),分别得到 3-烷基-1, 4-二噻烷-2-酮(7a-e)和 1, 4-二噻烷-2-酮(12),产率相当高。类似地,用 Pb (OAc)4 处理 2-亚烷基-1,3-二噻烷(13a-e)会导致扩环,得到 7a-e,而 2-亚苄基-1,3-二噻烷(13f)与 Pb (OAc)4 反应并没有产生预期的扩环产物,而是得到了 2-(α-乙酰氧基亚苄基)-1,3-二噻烷(8)。