@article { ISI:000244257400014, title = {Practical and facile approach towards indole alkaloids: (-)-mitralactonine}, journal = {Synlett}, number = {1}, year = {2007}, month = {JAN}, pages = {79-82}, publisher = {GEORG THIEME VERLAG KG}, type = {Article}, address = {RUDIGERSTR 14, D-70469 STUTTGART, GERMANY}, abstract = {

An efficient approach to (-)-mitralactonine using Pictet-Spengler cyclisation with a highly functionalised masked aldehyde is described. Sharpless asymmetric dihydroxylation (SAD) is utilised to introduce chirality in the key substrate.

}, keywords = {alkaloids, asymmetric, cyclisations, dihydroxylations, thioacetats}, issn = {0936-5214}, doi = {10.1055/s-2006-958434}, author = {Chavan, Subhash P. and Sharma, Pallavi and Sivappa, Rasapalli and Kalkote, Uttam R.} } @article { ISI:000250836500003, title = {Total synthesis of (+)-camptothecin via an intramolecular palladium-catalyzed cyclization strategy}, journal = {Synlett}, number = {17}, year = {2007}, month = {OCT}, pages = {2635-2638}, publisher = {GEORG THIEME VERLAG KG}, type = {Article}, address = {RUDIGERSTR 14, D-70469 STUTTGART, GERMANY}, abstract = {

The novel cascade intramolecular Pd-catalyzed cyclization followed by aromatization for the construction Of D ring of (+)-camptothecin as a key step is demonstrated.

}, keywords = {alkaloids, antitumor, cyclizations, Natural products, Palladium}, issn = {0936-5214}, doi = {10.1055/s-2007-991054}, author = {Chavan, Subhash P. and Pathak, Ashok B. and Kalkote, Uttam R.} } @article { ISI:000261466800007, title = {Tandem aza-michael-condensation-aldol cyclization reaction: approach to the construction of DE synthon of (+/-)-camptothecin}, journal = {Synlett}, number = {18}, year = {2008}, month = {NOV}, pages = {2781-2784}, publisher = {GEORG THIEME VERLAG KG}, type = {Article}, address = {RUDIGERSTR 14, D-70469 STUTTGART, GERMANY}, abstract = {

An efficient synthesis of the DE ring of camptothecin, employing a Reformatsky and a tandem one-pot, three-step transformation involving aza-Michael reaction, condensation with ethyl malonyl chloride followed by intramolecular {\textquoteleft}aldol{\textquoteright} reaction to furnish the dihydropyridone derivative from commercially available starting materials, has been achieved.

}, keywords = {Aldol cyclizations, alkaloids, antitumor, Natural products, Reformatsky reaction}, issn = {0936-5214}, doi = {10.1055/s-0028-1083539}, author = {Chavan, Subhash P. and Dhawane, Abasaheb N. and Kalkote, Uttam R.} }