Access to “Friedel–Crafts-Restricted” tert-Alkyl Aromatics by Activation/Methylation of Tertiary Benzylic Alcohols
摘要:
Herein we describe a two-step protocol to prepare m-tert-alkylbenzenes. The appropriate tertiary benzylic alcohols are activated with SOCl2 or concentrated HCl and then treated with trimethylaluminum, affording the desired products in 68-97% yields (22 examples). This reaction sequence is successful in the presence of a variety of functional groups, including acid-sensitive and Lewis-basic groups. In addition to t-Bu groups, 1,1-dimethylpropyl and 1-ethyl-1-methylpropyl groups can also be installed using this method.
An alternative method for the preparation of Erlotinib through a new chemical reaction for the preparation of the 4-(3-aminophenyl)-2-methyl-3-butyn-2-ol key intermediate of formula (IV) according to the following scheme.
Saxena, Anil K.; Arunamurthy, V.; Patnaik, G. K., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1980, vol. 19, # 10, p. 873 - 878
作者:Saxena, Anil K.、Arunamurthy, V.、Patnaik, G. K.、Jain, Padam C.、Anand, Nitya