Diastereoselective 1,6-Addition of α-Phosphonyloxy Enolates to <i>para</i>-Quinone Methides
作者:Amjad Ali、Raveena Jajoria、Harish K. Harit、Ravi P. Singh
DOI:10.1021/acs.joc.2c00030
日期:2022.4.15
8-diazabicyclo(5.4.0)undec-7-ene (DBU) is explored. Coupling of dialkylphosphites to α-ketoamides in the presence of a base follows [1,2]-phospha-Brook rearrangement, generating corresponding α-phosphonyloxy enolates that are subsequently seized by p-quinone methides (p-QMs). The two-step one-pot 1,6-conjugate addition provides effective access to a series of isatin-incorporated phosphate-bearing 1,6-adducts having
Ring Expansion of Isatins <i>via</i> 1,2-Phospha-Brook Rearrangement: A Route to the Synthesis of 2-Quinolinone-Derived <i>p</i>-Quinone Methides
作者:Amjad Ali、Harish K. Harit、Manju Devi、Dibyajyoti Ghosh、Ravi P. Singh
DOI:10.1021/acs.joc.2c01929
日期:2022.12.16
A Lewis acid-mediated one-carbon homologation approach to installing a 2-quinolinone core embedded with para-quinone methides, in a high yield of up to 92%, and with high regioselectivity has been developed. Also, post-synthetic modifications, including C–P, C–S, and C–C bond formations, have been demonstrated by the 1,6-addition of suitable nucleophiles. Further, cyclopropanation of 2-quinolinone-embedded