Reaktion #1445872

Reaktionsgleichung

methyl (1RS)-8-methyl-8-azabicyclo-[3.2.1]oct-2-ene-2-carboxylate

methylamine

sodium hydroxide

2,4,6-cycloheptatriene-1-carbonitrile

→

(1RS)-8-methyl-8-azabicyclo[3.2.1]oct-2-ene-2-carbonitrile

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeIn detail, the reaction scheme C
2. 2
   Sonstigeis synthesized
3. 3
   workup.ADDITIONa fluoropropyl group is introduced

Vorschrift

The reaction scheme C shown below is an example of reaction scheme for synthesizing an anhydro-ecgonine derivative (the formula 3) and a phenyltropane derivative (the formula 6) without producing cocaine as an intermediate. In detail, the reaction scheme C is a scheme in which methyl (1RS)-8-methyl-8-azabicyclo-[3.2.1]oct-2-ene-2-carboxylate (7: (1RS)-AECG; such an abbreviation of a compound name is hereinafter described in a parenthesis and properly used) is synthesized, and then a fluoropropyl group is introduced thereinto at the N-8 position to synthesize methyl [1RS-(2-exo,3-exo)]-8-(3-fluoropropyl)-3-(4-iodophenyl)-8-azabicyclo[3.2.1]octane-2-carboxylate (12: (1RS)-β-CIT-FP). Specifically, 2,4,6-cycloheptatriene-1-carbonitrile (4: CHT-CN) is allowed to react with methylamine in methanol solvent in the presence of sodium hydroxide to obtain (1RS)-8-methyl-8-azabicyclo[3.2.1]oct-2-ene-2-carbonitrile (6: (1RS)-AECG-CN). The cyano group of this compound is hydrolyzed and then converted to a methyl ester group to obtain methyl (1RS)-8-methyl-8-azabicyclo[3.2.1)oct-2-ene-2-carboxylate (7: (1RS)-AECG), which is allowed to react with phenylmagnesium bromide (PhMgBr) by a well-known method to obtain methyl [1RS-(2-exo,3-exo)]-3-phenyl-8-methyl-8-azabicyclo[3.2.1]octane-2-carboxylate (8: (1RS)-β-CPT). The tropane portion of this compound is converted to nortropane at the N-8 position, followed by substitution by a fluoropropane group at the N-8 position, whereby (1RS)-β-CIT-FP 12 can be obtained. optically active (1R)-β-CIT-FP can be obtained by optical resolution of (1RS)-β-CIT-FP 12 or by subjecting (1RS)-nor-β-CIT 11 to optical resolution to obtain an optically active substance in the course of the synthesis and continuing reactions shown in Reaction scheme C.

Quelle