(1 Z ,3 Z )-Buta-1,3-dienyl-1-lithium species and substituted tellurophenes by Te/Li exchange on (1 Z ,3 Z )-butyltelluro-1,3-butadienes and (1 Z ,3 Z )-1,4-bis(butyltelluro)-1,3-butadienes
作者:Miguel J. Dabdoub、Vania B. Dabdoub、Palimécio G. Guerrero、Claudio C. Silveira
DOI:10.1016/s0040-4020(97)00148-8
日期:1997.3
(1Z,3Z)-1-Butyltelluro-1,3-butadienes 8, 9 and 12 obtained by the hydrotelluration of but-1-en-3-ynes 1, 2 and 5 were transformed into the corresponding buta-1,3-dienyl-1-lithium by reaction with n-BuLi. 1,3-Butadienes 14, 15, 17-20 were obtained with retention of the double bond geometry by reaction of the butadienyllithium intermediates with electrophiles. The butadienyllithium 13 obtained by the Te/Li exchange reaction in the (12,3Z)-1-Butyltelluro-4-methoxy-1,3-Butadiene 8 was reacted with benzaldehyde to form the corresponding alcohol 15 with total retention of configuration, that undergoes hydrolysis resulting into the (E,E)-5-phenyl-2,3-pentadien-1-al 16. Hydrotelluration of the 1-butyltellurobut-1-en-3-cyclization, leading to substituted tellurophenes 24, 25, 27-29 via a sequential Csp(2)-Te and Csp(3)-Te bonds cleavage on reaction with n-BuLi followed by addition of electrophiles. (C) 1997 Elsevier Science Ltd.
(1Z,3Z)-1-丁基-1,3-丁二烯碲化物8、9和12是通过1-丁-3-炔-1-烯的水合碲化反应获得的,随后通过与n-BuLi的反应转化为相应的1-丁-1,3-二烯基锂。通过将这些丁二烯基锂中间体与电亲核试剂反应,在保留双键几何构型的情况下,得到了1,3-丁二烯14、15和17-20。通过Te/Li交换反应,在(12,3Z)-4-甲氧基-1-丁基-1,3-丁二烯碲化物8的基础上获得了丁二烯基锂13,并与苯甲醛反应形成了保留全部构型的相应醇15,该醇经水解生成(E,E)-5-苯基-2,3-戊二烯-1-醛16。1-丁基-1-烯-3-炔的水合碲化后,通过与n-BuLi的反应依次断裂Csp(2)-Te和Csp(3)-Te键,随后加入电亲核试剂,形成取代的碲代芳香烃24、25、27-29。 (C) 1997 Elsevier Science Ltd.