排序方式: 共有37条查询结果,搜索用时 15 毫秒
21.
Gowrisankar Reddipalli Mallam Venkataiah Nitin W. Fadnavis 《Tetrahedron: Asymmetry》2011,22(18-19):1778-1783
(?)-α-Conhydrine was synthesized from propargyl alcohol in 20% overall yield in nine steps. The key intermediates were obtained via a regioselective epoxide opening, cross-metathesis, tandem hydrogenation and hydrogenolysis, and stereoselective dihydroxylaton. The side product from the epoxide ring opening was used to synthesize the seven-membered amino sugar DMJ analogue. 相似文献
22.
23.
P. Veeraraghavan Ramachandran Gowrisankar ParthasarathyPravin D. Gagare 《Tetrahedron letters》2011,52(41):5359-5362
The preparation of 2-(arylmethoxy)isopinocampheols from pinanediol via the DIABL-H reduction of the corresponding aryl aldehyde acetals has been described. A systematic examination of the asymmetric aldol reaction of 3,3,3-trifluoropropionates led to the double diastereoselective aldol reaction of 2-(arylmethoxy)isopinocampheyl 3,3,3-trifluoropropionates providing anti-α-trifluoromethyl-β-hydroxy esters in 63-85% yields, ?99% anti-selectivity and 80-96% de for the anti-isomer. 相似文献
24.
We have introduced and studied a new class of fuzzy irresolute functions, called fuzzy strongly pre-irresolute functions,
by using fuzzy preopen sets. 相似文献
25.
Suneetha P. Krishna T. S. Gowrisankar M. Reddy M. Srinivasa Ramachandran D. 《Journal of Thermal Analysis and Calorimetry》2018,134(2):1151-1167
Journal of Thermal Analysis and Calorimetry - In the present paper, we reported the accurately measured densities (ρ), speed of sound (u) and refractive index (nD) for the binary mixture of... 相似文献
26.
The aim of this paper is to give a new class of fuzzy open sets called fuzzy pre-γ-open sets in fuzzy topological spaces. Also,a new type of fuzzy continuous functions called,fuzzy pre-γ-continuous functions is introduced and studied. 相似文献
27.
Saravanan Gowrisankar 《Tetrahedron letters》2005,46(29):4859-4863
A facile synthetic method of 3,4-disubstituted 2,5-dihydrofurans and 2,5-dihydropyrroles starting from the Baylis-Hillman adducts was developed. The 2,5-dihydrofuran skeleton was constructed via the consecutive radical cyclization, hydrolysis, halolactonization, and spontaneous decarboxylation strategy starting from the modified Baylis-Hillman adducts. 相似文献
28.
Novel pentacyclic benzoazepino[2,1-a]isoindole derivatives were synthesized by palladium-mediated consecutive cyclization from enamides of Baylis-Hillman adducts. 相似文献
29.
Saravanan Gowrisankar 《Tetrahedron》2006,62(17):4052-4058
Construction of furo[3,4-c]pyran ring skeleton was achieved starting from the Baylis-Hillman adducts. The synthesis was carried out by the successive introduction of propargyl alcohol, radical cyclization, reduction, allylation, and finally ring-closing metathesis reaction. 相似文献
30.
Saravanan Gowrisankar 《Tetrahedron letters》2007,48(17):3105-3108
Synthesis of dihydronaphthalene derivatives was carried out by allyltributylstannane-mediated vinyl radical cyclization as the key step from 4-aryl-1-iodobutene derivatives, which were derived from Baylis-Hillman adducts via vinyl radical cyclization. 相似文献