Intramolecular sulfamate ester oxidation

Like carbene insertions into carbon-hydrogen bonds, metal nitrene insertions occur in both intermolecular and intramolecular reactions.For intermole-cular reactions, a manganese(III) meio-tetrakis(pentafluorophenyl)porphyrm complex gives high product yields and turnovers up to 2600 amidations could be effected directly with amides using PhI(OAc)2 (Eq. 51). The most exciting development in intramolecular C—H reactions thus far has been the oxidative cychzation of sulfamate esters (e.g., Eq. 52), as well as carbamates (to oxazolidin-2-ones), ° and one can expect further developments that are of synthetic... 

Sulfamate indan-2-yl ester 145 is oxidized by iodobenzene diacetate to give condensed 1,2,3-oxathiazole di-A-oxides 146 (Equation 35). Various rhodium <2001JA6935, 2004HCA1607>, manganese(m) Schiff base <2005TL5403>, and ruthenium porphyrin <2002AGE3465> catalysts can be used for this transformation. Enantioselective intramolecular amidation is achieved with good yields. 

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