BIOTIN SYNTHESIS. I. SYNTHESIS OF 4-(4-CARBOXYBUTYL)-1,2-DIHYDROTHIENO[3,4-d]IMIDAZOL-2-ONE

Abstract
4-(4-Carboxybutyl)-1,2-dihydrothieno[3,4-d]imidazol-2-one [I], a precusor of dl-biotin, was synthesized via 6 steps starting from 4-methyl-2(1H)-imidazolone.