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■ A New Modification of Bischler-Napieralski Reaction for β-Arylethylisocynates and β-Arylethylurethans

Yoshisuke Tsuda,* Kimiaki Isobe, Jun Toda, and Jun’ichi Taga

*School of Pharmacy, Hokuriku University, 3-Ho, Kanagawa machi, Kanazawa 920-1181, Japan

Abstract

Two-step treatment of β-arylethylisocyanates (1) and -urethans (2) with POCl₃ followed by SnCl₄ gave the corresponding dihydroisocarbostyrils (6) in satisfactory yields; the method was conveniently applicable to the hindered isocyanates and urethans with complex structure.