@article {639,
	title = {N-bromosuccinimide promoted ring expansion reactions: Diastereoselective formation of functionalized azaspirocyclic cyclopentanones},
	journal = {Synlett},
	number = {14},
	year = {2003},
	note = {ISI Document Delivery No.: 741GTTimes Cited: 10Cited Reference Count: 30},
	month = {Nov},
	pages = {2131-2134},
	type = {Article},
	abstract = {N-Bromosuccinimide (NBS) induces ring enlargements of 2-(1-hydroxycyclobutyl)-p-toluenesulfonylenamides such as 1. These high yielding reactions typically occur with good diastereoselectivity. This ring expansion protocol under neutral conditions forms compounds that are potentially versatile intermediates for the construction of spirocycle-containing alkaloids.},
	keywords = {bromine, CONSTRUCTION, entry, HALICHLORINE, ION, KETONES, PINNAIC ACID, piperidines, REDUCTION, ring expansion, spiro compounds, SPIROCYCLIC CORE, STEREOSELECTIVE},
	isbn = {0936-5214},
	url = {<Go to ISI>://000186450900005},
	author = {Hurley, P. B. and Dake, G. R.}
}
@article {5167,
	title = {A dehydrogenated cycloadduct of N-phenylmaleimide and the azomethine ylide derived from ninhydrine and phenylalanine: Structure and conformation},
	journal = {Monatshefte Fur Chemie},
	volume = {132},
	number = {10},
	year = {2001},
	note = {ISI Document Delivery No.: 492THTimes Cited: 1Cited Reference Count: 14},
	month = {Oct},
	pages = {1213-1224},
	type = {Article},
	abstract = {{The structure of the dehydrogenation product 1 {\textquoteright} ,3a {\textquoteright} -dihydro-3 {\textquoteright}-((1,3-dioxoindan-2-ylidene)-phenyl-methyl)-5 {\textquoteright} -phenyl-spiro-(indan-2,1 {\textquoteright} -pyrrolo[3,4-c]pyrrole)-1,3,4 {\textquoteright} ,6 {\textquoteright}-(5 {\textquoteright}H, 6a {\textquoteright}H)-tetrone derived from the cycloadducts (+/-)-(3a {\textquoteright}S,6a {\textquoteright}R)-1 {\textquoteright} ,3a {\textquoteright} -dihydro-3 {\textquoteright}-((R)-alpha-(1,3-dioxoindanyl)-benzyl)-5 {\textquoteright} -phenyl-spiro-(indan-2,1 {\textquoteright} -pyrrolo[3,4-c]pyrrole)-1,3,4 {\textquoteright} ,6 {\textquoteright} (5H,6a {\textquoteright}H)-tetrone and/or (+/-)-(3a {\textquoteright}S,6a {\textquoteright}R)-1 {\textquoteright} ,3a {\textquoteright} -dihydro-3 {\textquoteright}-((S)-alpha-(1,3-dioxoindanyl)-benzyl)-5 {\textquoteright} -phenyl-spiro-(indan-2,1 {\textquoteright} -pyrrolo[3,4-c]pyrrole)-1,3,4 {\textquoteright} ,6 {\textquoteright} (5H,6a {\textquoteright}H)-tetrone, which were synthesized by 1,3-dipolar cycloaddition of N-phenylmaleimide to 2-((2-(1,3-dioxoindan-2-yl)-2-phenyl-ethenyl)-imino)-indan-1,3-dione, was determined by X-ray analysis. Crystal data (CCD, 180K): rhombohedral, R (3) over bar},
	keywords = {dynamic H-1 NMR spectroscopy, molecular modeling, spiro compounds, X-ray structure determination},
	isbn = {0026-9247},
	url = {<Go to ISI>://000172183300010},
	author = {Preu, L. and Kliegel, W. and Rettig, S. J. and Trotter, J.}
}
