Selective Synthesis of<i>trans</i>- and<i>cis-p</i>-Mentha-1,8-dien-5-ol from<i>trans</i>-Verbenol
作者:Michel Bulliard、Geneviève Balme、Jacques Goré
DOI:10.1055/s-1988-27771
日期:——
A selective synthesis of both trans- and cis- p-mentha-1,8-dien-5-ol from trans-verbenol is described. The sequence leading to trans-p-mentha-1,8-dien-5-ol consists of cleavage of the cyclobutane ring of pinene with N-bromosuccinimide in acetone to give the acetonide of 6-bromo-trans-p-menthene-5,8-diol, hydrodebromination with lithium aluminum hydride. and acidic treatment of the resultant acetonide of trans-p-menthene-5,8-diol. cis-p-Mentha-1,8-dien-5-ol is obtained by Swern oxidation of the trans-isomer and reduction of the resultant ketone with lithium tri-sec-butylborohydride. Acidic treatment of the acetonide of cis-p-menthene-5,8-diol (obtained from cis-verbenol) gives exclusively p-mentha-1(7),2-dien-8-ol.
描述了一种从反芬醇选择性合成反式和顺式 p-梅那-1,8-二烯-5-醇的方法。合成反式 p-梅那-1,8-二烯-5-醇的步骤包括用 N-溴代琥珀酰亚胺在丙酮中切裂松烯的环丁烷,生成 6-溴-反式-p-梅那烯-5,8-二醇的乙酰基醚;然后用锂铝氢化物进行去溴化;最后对生成的反式-p-梅那烯-5,8-二醇的乙酰基醚进行酸性处理。顺式 p-梅那-1,8-二烯-5-醇是通过对反式异构体进行 Swern 氧化,并用锂三-sec-丁基氢硼化物还原得到的。对顺式-p-梅那烯-5,8-二醇(由顺式芬醇获得)的乙酰基醚进行酸性处理,可以专门得到 p-梅那-1(7),2-二烯-8-醇。