J. Ma et al., HYDROISOQUINOLINE RING CONSTRUCTION VIA THE DIELS-ALDER REACTION OF ARECOLONE-DERIVED ENOL SILYL ETHERS, Heterocycles, 38(7), 1994, pp. 1609-1618
Diels-Alder reaction of the arecolone-derived siloxydienes (7, 14) was
described. The hexahydroisoquinoline derivatives (21, 22, 23) were pr
epared from the reaction of 14 with methyl propiolate followed by Mich
ael addition to the amido acrylates (18, 19, 20).