作者:Jonathan H. George、Mark McArdle、Jack E. Baldwin、Robert M. Adlington
DOI:10.1016/j.tet.2010.05.052
日期:2010.8
Simplified ethyl-substituted labdane diterpenoids 14 and 19 have been synthesised from (+)-sclareolide (18). Biomimetic rearrangements of these compounds, involving stereospecific 1,2-alkyl and hydride shifts, have been carried out by treatment with a variety of Lewis and protic acids. Halimane compounds, such as 34 and simple dehydration products such as 3, 32 and 33 have been formed either selectively
由(+)-香紫苏内酯(18)合成了简化的乙基取代的拉丹烷二萜14和19。这些化合物的仿生重排涉及立体特异性的1,2-烷基和氢化物转移,已通过用多种路易斯酸和质子酸处理而进行。Halimane化合物,如34和简单的脱水产品,如3,32和33已经形成或者选择性地或作为根据反应条件的混合物。但是,进一步重排至诸如1和2这样的环氧烷产品 没有观察到,表明对这些天然产物在体内形成的高度酶促控制。