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Intramolecular cyclopropanation followed by ring opening of remotely placed furan was demonstrated using rhodium(II) catalysed cyclic diazoamides tethered on furan to produce 12- to 23-membered oxindole incorporated macrocycles. The length of the spacer is an important factor to decide the stereoselectivity of the product.
Titanium(IV) chloride and silyl reagents mediated regio- and chemoselective ring opening reactions of oxa-bridged piperidinone ring systems were demonstrated. This methodology interestingly undergoes the stereoselective ring opening at the C–O bond of oxa-bridged piperidinone ring systems. Study of TiCl 4 with hydride or non-hydride silyl reagents furnished the product with selectivity. This...
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