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2 article(s) from Chimni, Swapandeep Singh

Primary-tertiary diamine-catalyzed Michael addition of ketones to isatylidenemalononitrile derivatives

Akshay Kumar and
Swapandeep Singh Chimni

Beilstein J. Org. Chem. 2014, 10, 929–935, doi:10.3762/bjoc.10.91

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Graphical Abstract

Figure 1: Oxindole based Michael acceptors.

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Figure 2: Primary-tertiary diamine organocatalysts.

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Scheme 1: Diamine catalyzed Michael addition of acetone to isatylidenemalononitrile.

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Scheme 2: Substrate scope of the addition of 2 with 3 catalyzed by 1a D-CSA.

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Scheme 3: One-pot, three-component Knoevenagel condensation–Michael addition.

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Scheme 4: Cascade reduction–cyclization for the synthesis of spirooxindole.

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Full Research Paper

Published 24 Apr 2014

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Mechanochemistry assisted asymmetric organocatalysis: A sustainable approach

Pankaj Chauhan and
Swapandeep Singh Chimni

Beilstein J. Org. Chem. 2012, 8, 2132–2141, doi:10.3762/bjoc.8.240

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Scheme 1: Proline-catalysed aldol reaction in a ball-mill.

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Scheme 2: Proline-catalysed aldol reaction between solid substrates (1b and 2a).

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Scheme 3: (S)-Binam-L-prolinamide catalysed asymmetric aldol reaction by using a ball-mill. ^aConversion.

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Scheme 4: Asymmetric aldol reaction assisted by ball-milling catalysed by dipeptides (A) with III and (B) wit...

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Scheme 5: Thiodipeptide-catalysed asymmetric aldol reaction of (A) ketones with aldehydes and (B) acetone wit...

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Scheme 6: Enantioselective Michael reaction of aldehydes with nitroalkenes catalysed by pyrrolidine-derived o...

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Scheme 7: Chiral squaramide catalysed asymmetric Michael reaction assisted by ball-milling.

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Scheme 8: Asymmetric organocatalytic Michael reaction assisted by pestle and mortar grinding.

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Scheme 9: C-2 symmetric thiourea catalysed enantioselective MBH reaction.

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Scheme 10: Quinine-catalysed ring opening of meso-anhydride by ball-milling.

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Scheme 11: Ball-milling-assisted (A) synthesis of glycine schiff bases and (B) their organocatalytic asymmetri...

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Scheme 12: Enantioselective amination of β-ketoester by using pestle and mortar.

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Published 06 Dec 2012

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