الفهرس 
Summary
4-Alkyl ( II )-Furan-2,3-diones 1.1 SynthesisOnly 14 pages are availabe for public view
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Abstract
This work is planned to study the behaviour of furan- and pyrrolee2,3.diones towards nucleophilic reactions such as semicarbazones, tluosemicarbazones and to use them as potential precursors through lhennolysis to incorporate a different new heterocyclic compounds in
direct and simple way.
Synthesis of 1,2_DihyDROPyrimidines:
Reaction of furan-2,3-dione 112 with semicarbazones 113 a-d or lhiosemicarbazones 113 e,f in toluene at reflux led to the formation of
4,S_disubstituted-lH-pyrimidines 116 a-f in moderate yields ( 40-650/0 ).
u’uthesis of Pyrrole-2,3-Dione:
Treatment of the yellow furandione 112 with arylisocyanate 117 a,b at 70’C fUl11ished the corresponding red colour pyrrole-2,3-diones 119
Thermolytic reactions of furan-2,3-dionc with aryllisocyanates, dicyciohexylcarbodiiIllide and iInines:
Synthesis of 1,3-0xazines:
The reaction of furandione 112 with heterocu11111lenes,
arylisocyanates 117 a,b 111 boiling xylene; gave the corresponding 1,33oxazine derivatives 124 a,b in (54-70 0/0) yields. The fOlluation of these 1,3-oxazines 111ay be occured via a [4+2] cyc1oaddition reaction of uuoxoketene and heterocll11111lenes ( Scheme 3 ).