Two alternative synthetic routes of the left-half segment 5 have been developed. Efficient condensation between the left and right segments followed by Pd-catalyzed deoxygenation and further elaboration achieved the first total synthesis of AAL-toxin TA(1). This allowed us to synthesize various AAL-toxin analogs which would be useful for investigating SAR studies of AAL-toxins. (C) 1999 Elsevier Science Ltd. All rights reserved.
Two alternative synthetic routes of the left-half segment 5 have been developed. Efficient condensation between the left and right segments followed by Pd-catalyzed deoxygenation and further elaboration achieved the first total synthesis of AAL-toxin TA(1). This allowed us to synthesize various AAL-toxin analogs which would be useful for investigating SAR studies of AAL-toxins. (C) 1999 Elsevier Science Ltd. All rights reserved.