Regiocontrolled benzannulation of diaryl(gem-dichlorocyclopropyl)methanols for the synthesis of “unsymmetrically” substituted α-arylnaphthalenes
摘要:
Aryl(1)(aryl(2))(gem-dichlorocyclopropyl)methanols 1 underwent alternative benzannulation to give ''unsymmetrically'' substituted 1-(aryl(1))-4-chloronaphthalenes 2/A catalyzed by SnCl4 or TiCl4 and to give 1-(aryl(2))-4-chloronaphthalenes 2/B catalyzed by silyl triflates with good to excellent selectivities. (C) 1997 Elsevier Science Ltd.
Regiocontrolled benzannulation of diaryl(gem-dichlorocyclopropyl)methanols for the synthesis of “unsymmetrically” substituted α-arylnaphthalenes
摘要:
Aryl(1)(aryl(2))(gem-dichlorocyclopropyl)methanols 1 underwent alternative benzannulation to give ''unsymmetrically'' substituted 1-(aryl(1))-4-chloronaphthalenes 2/A catalyzed by SnCl4 or TiCl4 and to give 1-(aryl(2))-4-chloronaphthalenes 2/B catalyzed by silyl triflates with good to excellent selectivities. (C) 1997 Elsevier Science Ltd.
Regiocontrolled Benzannulation of Diaryl(<i>gem</i>-dichlorocyclopropyl)methanols for the Synthesis of Unsymmetrically Substituted α-Arylnaphthalenes: Application to Total Synthesis of Natural Lignan Lactones
synthesis of highly substituted α-arylnaphthalene analogues has been developed utilizing Lewis acid-promoted regiocontrolled benzannulation of aryl(aryl‘)-2,2-dichlorocyclopropylmethanols (aryl ≠ aryl‘; abbreviated as AACMs). Both AACM diastereomers were easily prepared via highly stereoselective addition (>95/5) of ArLi to gem-dichlorocyclopropropyl aryl‘ ketones. The choice of Lewis acids determined
Regiocontrolled benzannulation of diaryl(gem-dichlorocyclopropyl)methanols for the synthesis of “unsymmetrically” substituted α-arylnaphthalenes
作者:Yoshinori Nishii、Taichi Yoshida、Yoo Tanabe
DOI:10.1016/s0040-4039(97)01713-9
日期:1997.10
Aryl(1)(aryl(2))(gem-dichlorocyclopropyl)methanols 1 underwent alternative benzannulation to give ''unsymmetrically'' substituted 1-(aryl(1))-4-chloronaphthalenes 2/A catalyzed by SnCl4 or TiCl4 and to give 1-(aryl(2))-4-chloronaphthalenes 2/B catalyzed by silyl triflates with good to excellent selectivities. (C) 1997 Elsevier Science Ltd.