Methyl chloroformate → Methyl 3-(4,4-dimethyl-chroman-6-yl)propiolate
Reaction equation
CC1(C)[CH2:11][CH2:10][C:9]([CH3:13])([CH3:12])[C:8]2[CH:7]=[C:6]([C:14]#[C:15][C:16]([O:18][CH2:19]C)=[O:17])[CH:5]=[CH:4][C:3]1=2.CC1(C)C2C(=CC=C(C#C)C=2)[O:26]CC1.COC(Cl)=O.C([Li])CCC>>[CH3:12][C:9]1([CH3:13])[C:8]2[C:3](=[CH:4][CH:5]=[C:6]([C:14]#[C:15][C:16]([O:18][CH3:19])=[O:17])[CH:7]=2)[O:26][CH2:11][CH2:10]1Participants
5
Procedure
Employing the same general procedure as used for the preparation of ethyl 3-[5,5,8,8,-tetramethyl-5,6,7,8-tetrahydronaphth-2-yl]propiolate (Compound A) but instead using 1.86 g (10 mmols) of [4,4-dimethyl-chroman-6-yl]ethyne, 2 g (21.3 mmols) of methylchloroformate and 11 mmols of n-butyllithium the title compound was obtained as a yellow solid.