1,3,2‐Oxazastibinanes: Novel six‐membered heterocycles

Abstract

ABSTRACT:The hitherto unreported oxazastibinanes 3 have been synthesized by the sodium borohydride reduction

2,2,2‐triaryl‐4‐oxo‐1,3,2‐benzoxazastibinines

“…Similar trend has been observed for C N stretching vibration indicating C N Sb bonding [12][13][14].…”

“…The phenolic C O stretching vibration appearing at 1242 cm −1 in salicylanilide undergoes a shift toward higher frequency in benzoxazastibininones, corroborating 2,2,2-Triaryl-4-oxo-1,3,2-benzoxazastibinines 623 SCHEME 1 the participation of oxygen in C O Sb bonding [21,22]. Similar trend has been observed for C N stretching vibration indicating C N Sb bonding [12][13][14].…”

“…Only a few such heterocycles containing five-membered rings have been reported [10,11]. We have synthesized six-membered benzoxazastibinines [12,13] and have recently reported the synthesis of oxazastibinanes [14]. Oxo derivative of 1,3-oxazine [1], 1,3,2-benzoxazaphosphinine [15], and 1,3,2-benzoxazaphosphorine [16] are known in literature; however, there is no report available on the oxo derivative of 1,3,2-benzoxazastibinines.…”

“…Only a few such heterocycles containing five-membered rings have been reported [10,11]. We have synthesized six-membered benzoxazastibinines [12,13] and have recently reported the synthesis of oxazastibinanes [14]. Oxo derivative of 1,3-oxazine [ We report here an efficient route to 4-oxo-1,3,2benzoxazastibinines.…”