<style face="normal" font="default" size="100%">Diastereoselective amidoalkylation of (3S,7aR)-6-benzyl-7-hydroxy-3-phenyltetra-hydro-5H-imidazo[1,5-c][1, 3]thiazol-5-one : a short and highly efficient synthesis of (+)-biotin</style>

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<style face="normal" font="default" size="100%">Diastereoselective amidoalkylation of (3S,7aR)-6-benzyl-7-hydroxy-3-phenyltetra-hydro-5H-imidazo[1,5-c][1, 3]thiazol-5-one : a short and highly efficient synthesis of (+)-biotin</style>

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<style face="normal" font="default" size="100%">Unusual stereochemical outcome of radical cyclization: synthesis of (+)-biotin</style>