Double Conjugate Addition of Dithiols to Propargylic Carbonyl Systems To Generate Protected 1,3-Dicarbonyl Compounds
作者:Helen F. Sneddon、Alexandra van den Heuvel、Anna K. H. Hirsch、Richard A. Booth、David M. Shaw、Matthew J. Gaunt、Steven V. Ley
DOI:10.1021/jo052514s
日期:2006.3.31
methoxide to a wide variety of propargylic carbonyl containing compounds. The products of these reactions are differentiated, 1,3-dicarbonyl systems useful for various synthesis programs. By judicious use of hydroxylated substrates tandem cyclization occurs to afford tetrahydropyran lactols or, in the case of hydroxy-substituted propargylic esters, lactones. The corresponding amino-substituted propargylic
The Development of a Sulfamate-Tethered Aza-Michael Cyclization Allows for the Preparation of (−)-Negamycin tert-Butyl Ester
作者:Harshit Joshi、Appasaheb K. Nirpal、Debobrata Paul、Steven P. Kelley、Joel T. Mague、Shyam Sathyamoorthi
DOI:10.1021/acs.joc.4c00604
日期:2024.4.19
We present the first examples of intramolecular aza-Michael cyclizations of sulfamates and sulfamides onto pendant α,β-unsaturated esters, thioesters, amides, and nitriles. Stirring the substrate with catalytic quantities of the appropriate base delivers the product in good yield and excellent diastereoselectivity. The reactions are operationally simple, can be performed open to air, and are tolerant