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N -Cbz sulfilimine, prepared from the corresponding sulfoxide using the Burgess reagent, has been employed as an intramolecular nucleophile for the regio- and stereoselective preparation of a bromo-carbamate from an alkene. The bromo-carbamate has been utilized as an advanced common synthon for...
The efficiency of microwave irradiation at low temperature for glycosylations is described. Although oligosaccharide synthesis usually requires reactive donors for glycosylations, which have leaving groups on the anomer positions, i.e., trichloroacetoimidates, halogenates, thioalkyl glycosides,...
The applicability of polymer-supported diphenylprolinol derivatives in directing either asymmetric epoxidation or Michael addition of suitable α,β-unsaturated substrates has been assessed. Epoxidation of cinnamaldehyde in the solid state give poorer yields and stereoselectivities than in the...
Synthesis and elucidation of absolute stereochemistry of salaprinol ( 3 ) isolated from the root and stems of Salacia prinoides , which has been used for the treatment of diabetes in India, Sri Lanka, and Southeast Asia countries, is described. Compound 3 and its 2′-epimer, epi -salaprinol (...
The bromination reaction of 1,2,3,4-tetrahydroquinoline ( 7 ) was investigated by NBS and molecular bromine. One-pot synthesis is described for synthetically valuable 4,6,8-tribromoquinoline ( 3 ) and 6,8-dibromo-1,2,3,4-tetrahydroquinoline ( 6 ) on bromination of 1,2,3,4-tetrahydroquinoline ( 7...
Fixation of CO 2 is one of the most important priorities of the scientific community dedicated to reduce global warming. In this work, we propose new methods for the fixation of CO 2 using the guanidine bases tetramethylguanidine (TMG) and 1,3,4,6,7,8-hexahydro-2 H -pyrimido(1,2- a )-pyrimidine...
The regioselective nitration of 25,27-dipropoxythiacalix(4)arene was carried out as a key step in the synthesis of thiacalix(4)arene derivative bearing two arylureido functions on the upper rim. The preorganisation of ureido units using the thiacalix(4)arene/calix(4)arene moieties as a molecular...
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