23610-70-0

Upstream product

• 2568-36-7 6,6-dibromobicylo[3.1.0]hexane 
• 50-00-0 formaldehyd 
• 677301-66-5 (3R,3aS,6S,7aS)-N-p-tolylsulfonyl-3-acetyloxy-3a-(3,4-methylenedioxyphenyl)-6-hydroxy-2,3,3a,6,7,7a-hexahydroindole 
• 215609-79-3 (3R,3aS,7aS)-N-p-tolylsulfonyl-3-acetyloxy-3a-(3,4-methylenedioxyphenyl)-2,3,3a,6,7,7a-hexahydroindole 

Downstream Products

• 1374670-93-5 C₂₃H₂₀BrNO₅ 

Relevant academic research and scientific papers

Application of Electrocyclic Ring-Opening and Desymmetrizing Nucleophilic Trappings of meso-6,6-Dibromobicyclo[3.1.0]hexanes to Total Syntheses of Crinine and Haemanthamine Alkaloids

The thermally induced electrocyclic ring-opening of C2-symmetric (meso) 6,6-dibromobicyclo[3.1.0]hexanes such as 10 in the presence of the chiral, nonracemic 1°-amine 28 afforded a ca. 1:1 mixture of the diastereoisomeric and chromatographically separable 1-amino-2-bromo-2-cyclohexenes 37 (42%) and 38 (45%). Each of these was elaborated over 13 steps, including Suzuki-Miyaura cross-coupling, radical cyclization, and Pictet-Spengler reactions, into (-)- or (+)-crinane (1 or ent-1, respectively). Variations on these protocols were applied to the total syntheses of (+)- and (-)-11-hydroxyvattitine [(+)- and (-)-3], (+)- and (-)-bulbispermine [(+)- and (-)-4], (+)- and (-)-haemanthamine [(+)- and (-)-5], (+)- and (-)-pretazettine [(+)- and (-)-6], and (+)- and (-)-tazettine [(+)- and (-)-7] as well as (±)-hamayne [(±)-8] and (±)-apohaemanthamine [(±)-9]. A number of these alkaloids were synthesized for the first time.