134858-17-6Relevant articles and documents
Synthesis of 1,6-Methanoannulenopyridines by Tandem Aza-Wittig Reaction/Electrocyclisation
Bohn, Thomas,Kramer, Walter,Neidlein, Richard,Suschitzky, Hans
, p. 947 - 952 (2007/10/02)
Iminophosphoranes 1 (X = PPh3) derived from the corresponding 1,6-methanoannulenes have been made to react with isothiocyanates and also with aromatic aldehydes to give, by an aza-Wittig reaction followed by cyclisation, novel 1,6-methanoannulenopyridines of structural types 2 and 6.Aza-Wittig reactions of the 2-triphenylphosphoranylideneamino derivative 3 (x = PPh3) with aromatic aldehydes or isothtiocyanates led to the Schiff's bases 3 (X = CHAr) or carbodiimides (X = C=NAr) respectively.The latter on treatment with enamines gave, by a Diels-Alder cyclisation, the annulenopyridines 12.
The Synthesis of Novel N-Heterocycles from 2-Azido-, 2-Vinylazido- and 2-Formyl-1,6-Methanoannulene-2-carbaldehydes
Suschitzky, Hans,Kramer, Walter,Neidlein, Richard,Rosyk, Peter,Bohn, Thomas
, p. 923 - 927 (2007/10/02)
The preparation of 2-azido-1,6-methanoannulene 2 from 2-lithioannulene is described.The annulene 2 underwent ring expansion on thermolysis in the presence of various secondary amines to give novel bridged aza-annulenes of type 3 and also gave 1,3-dipolar addition products.When heated the vinyl azides 13 (R1 = R2 = H) and 13 underwent cyclisation to give the annulenopyrroles 14 and 15 respectively.Annulenopyridines such as 18 were obtained from the iminophosphorane 16 via an aza-Wittig reaction with phenyl or allyl isothiocyanate or tolyl isocyanate.Some 2-formyl derivatives 1 (R1 = CHO) when treated with tosylmethyl isocyanide yielded oxazolylannulenes 19.