Formation of Seven-Membered Carbocycles via 7-<i>endo</i> Mode Cyclization of Lithioheptatrienes
作者:Ken-ichiro Kanno、Eri Igarashi、Yuki Mizukami、Kiyohiko Nakajima、Zhiyi Song、Tamotsu Takahashi
DOI:10.1021/acs.orglett.6b02956
日期:2016.12.16
The highly selective synthesis of triene derivatives was achieved by a zirconocene-mediated three-component coupling reaction, and the trienes were efficiently subjected to 7-endo mode cyclization. The reaction of unsymmetrical zirconacyclopentadienes prepared from two different alkynes with N-bromosuccinimide (NBS) followed by treatment with allyl halides in the presence of CuCl afforded the corresponding
三烯衍生物的高度选择性合成是通过锆茂介导的三组分偶联反应实现的,并且三烯被有效地进行了7-内模环化。由两种不同的炔烃制得的不对称氧化锆环戊二烯与N-溴代琥珀酰亚胺(NBS)的反应,然后在氯化铜的存在下用烯丙基卤化物进行处理,可得到相应的庚烯,收率很高。当三烯与有机锂试剂反应,7-内切模式发生环化顺利,得到相应的环庚二烯。