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X-ray phase-contrast microCT is becoming a valuable tool for studies of organic samples in medicine and biology.

An efficient four-step sequence has been developed for the synthesis of 3,4-isopropylidenedioxypyrrolidine hydrotosylate starting from inexpensive N-benzylmaleimide. This approach features a novel N-debenzylation procedure that utilizes the corresponding borane-benzylamine complex as an internal hydrogen-transfer source. This palladium-catalyzed tandem protonolysis/hydrogenolysis allows cleavage of the boraneamine adduct and debenzylation in a single operation.

Development of an efficient bond-forming sequence and optimization of reaction conditions are described for the synthesis of CP-945,598-01 (1 • HCl), a CB 1 antagonist in clinical studies for the treatment of obesity. Reordering of the bond-forming sequence provided a more efficient synthesis and avoided the use of phosphorous oxychloride. A telescoped reaction sequence (4 f 9) was developed to avoid a problematic isolation. Product isolations were developed so as to provide efficient throughput by minimizing solvent volumes and avoiding slow filtrations.