A Scalable Protocol for the Regioselective Alkylation of 2-Methylcyclohexane-1,3-dione with Unactivated sp3 Electrophiles
摘要:
A method for the C-selective alkylation of 2-methylcyclohexane-1,3-dione with unactivated sp(3) electrophiles is accomplished via alkylation and subsequent deprotection of the derived ketodimethyl hydrazones. The present method provides a high-yielding entry to dialkyl cycloalkanones that cannot be accessed via direct alkylation of 2-methylcyclohexane-1,3-dione. The title reaction may be useful in the scalable preparation of terpene and steroidal building blocks in the arena of natural product synthesis.
Heteroaromatic analogs of benzomorphan. Synthesis of novel thiazolo(4,5-f)morphans.
作者:KIMIO KATSUURA、MASAO OHTA、KEMMOTSU MITSUHASHI
DOI:10.1248/cpb.29.1780
日期:——
Monothiazolization of ethyl 2-methyl-1, 3-dioxo-2-cyclohexaneacetate (I) afforded 2-aminothiazole derivative (IIa) corresponding to tetralone. In several steps, IIa was converted to some thiazolo [4, 5-f] morphans (X) via 9-oxothiazolo [4, 5-f] morphan (VIII).
A method for the C-selective alkylation of 2-methylcyclohexane-1,3-dione with unactivated sp(3) electrophiles is accomplished via alkylation and subsequent deprotection of the derived ketodimethyl hydrazones. The present method provides a high-yielding entry to dialkyl cycloalkanones that cannot be accessed via direct alkylation of 2-methylcyclohexane-1,3-dione. The title reaction may be useful in the scalable preparation of terpene and steroidal building blocks in the arena of natural product synthesis.