245674-39-9

Upstream product

• 501-53-1 benzyl chloroformate 
• 132974-83-5 (5S)-5-[[(tert-butyldiphenylsilyl)oxy]methyl]pyrrolidin-2-one 
• 245648-28-6 (S)-benzyl 2-(((tert-butyldiphenylsilyl)oxy)methyl)-5-oxopyrrolidine-1-carboxylate 

Downstream Products

• 245648-29-7 benzyl (2S,5RS)-2-[(tert-butyldiphenylsilyloxy)methyl]-5-methoxypyrrolidine-1-carboxylate 
• 1400145-08-5 benzyl (2S,5S)-2-[(tert-butyldiphenylsilyloxy)methyl]-5-(5-oxo-2,5-dihydrofuran-2-yl)pyrrolidine-1-carboxylate 
• 1400145-09-6 benzyl (2S,5S)-2-[(tert-butyldiphenylsilyloxy)methyl]-5-(5-oxo-2,5-dihydrofuran-2-yl)pyrrolidine-1-carboxylate 

Relevant academic research and scientific papers

Total synthesis of (-)-sessilifoliamide J

An efficient synthesis of the Stemona alkaloid (-)-sessilifoliamide J (1) in 12 steps and 7.7% overall yield from the known building block 8 is presented. The synthesis features the Corey lactonization reaction and a highly diastereoselective α-methylation reaction to build the spirolactone moiety.

Efficient and Expeditious Protocols for the Synthesis of Racemic and Enantiomerically Pure Endocyclic Enecarbamates from N-Acyl Lactams and N-Acyl Pyrrolidines

A mild, practical, and straightforward protocol for the construction of endocyclic enecarbamates starting from N-acyl lactams and N-acyl pyrrolidines is presented. Lactams were reduced to the corresponding α-hydroxycarbamates in good to excellent yields using DIBAL-H, SuperHydride, or NaBH4 followed by β-elimination (dehydration) promoted by trifluoroacetic anhydride in the presence of hindered nitrogenated bases such as 2,6-lutidine, diisopropylethylamine, or triethylamine. Small variations of this protocol permitted the preparation of several endocyclic enecarbamates (12 examples) in good to excellent overall yields (56-96%). The protocol was demonstrated to be applicable to several ring sizes, compatible with different protecting groups, and to be mild enough to prevent racemization of racemization-prone stereocenters. The efficacy of the procedure in the preparation of enantiomerically pure endocyclic enecarbamates was also demonstrated and compared to the commonly used Shono's protocol, which in our hands led to partial racemization of the endocyclic enecarbamate 18c.