Reactions of the 1-halo-7-(2-hydroxyethoxy)cycloheptenes and the 3-halo-4-(2-hydroxyethoxy)bicyclo[3.2.1]oct-2-enes with potassium t-butoxide
作者:A.T. Bottini、B.R. Anderson、V. Dev、K.A. Frost
DOI:10.1016/0040-4020(76)85147-2
日期:1976.1
Reactions of 1 - bromo - 7 - (2 - hydroxyethoxy)cycloheptene 2 and its chloro analogue 3 with potassium t-butoxide in dimethyl sulphoxide or tetrahydrofuran gave cycloheptatriene and cis - 8,11 - dioxabicyclo[5.4.0]undec - 2 - ene 18 as the major products together with small amounts of the trans-isomer 17,8,11-dioxabicyclo[5.4.0]undec - 1(7) - ene 14, 8,11 - dioxabicyclo[5.4.0] - undec - 1 - ene 19
1-溴-7-(2-羟基乙氧基)环庚烯2及其氯类似物3与叔丁醇钾在二甲亚砜或四氢呋喃中的反应生成环庚三烯和顺式8,11-二氧杂双环[5.4.0]十一烷基-2-烯18作为主要产物与少量的的共同反式-异构体17,-8,11-二氧杂二环[5.4.0] - 1(7) -烯14,8.11 -二氧杂双环[5.4.0] -十一碳- 1 -烯烃19,环庚2-烯酮乙烯缩酮15,环庚3-烯酮乙烯缩酮16以及1-和2-叔丁氧基环庚-1,3-二烯20。3-溴和3-氯-4-(2-羟基乙氧基)双环[3.2.1] oct-2-烯4和5的相似反应得到4,7-二氧三环[7.2.1.0 3,8 ] dodeca-2 -烯26为主要产物,并有少量3,6-二氧三环[7.2.1.0 2,7 ]十二烷基-2(7)-烯27和双环[3.2.1] oct-3-烯-2-1乙烯缩酮28。讨论了这些转换的机制。