The first total synthesis of benzopyranobenzazepine alkaloid (+/-)-clavizepine (1) has been achieved by using the Bradsher cyclization of the keto ester 16 (leading to 18) and the Pummerer-type cyclization of the sulfoxide 25 (leading to 26) as the key steps.
The first total synthesis of benzopyranobenzazepine alkaloid (+/-)-clavizepine (1) has been achieved by using the Bradsher cyclization of the keto ester 16 (leading to 18) and the Pummerer-type cyclization of the sulfoxide 25 (leading to 26) as the key steps.