1990
DOI: 10.1080/00397919008052291
|View full text |Cite
|
Sign up to set email alerts
|

The Preparation of Substituted 5H-Pyrazolo[1,5-c] [1,3]-Benzoxazin-5-ones from the Trianions of Certain Hydroxyphenylcarboethoxyhydrazones

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2

Citation Types

0
4
0

Year Published

1990
1990
2011
2011

Publication Types

Select...
8

Relationship

1
7

Authors

Journals

citations
Cited by 18 publications
(4 citation statements)
references
References 7 publications
0
4
0
Order By: Relevance
“…Recently, Langer and coworkers reported an efficient method for the synthesis of pyrazole-3-carboxylates 28a 29 The cyclic products 65 were formed after treatment of the reaction mixture with acid (Scheme 15, Table 9). …”
Section: Scheme 12 Synthesis Of Functionalized Pyrazolesmentioning
confidence: 99%
See 1 more Smart Citation
“…Recently, Langer and coworkers reported an efficient method for the synthesis of pyrazole-3-carboxylates 28a 29 The cyclic products 65 were formed after treatment of the reaction mixture with acid (Scheme 15, Table 9). …”
Section: Scheme 12 Synthesis Of Functionalized Pyrazolesmentioning
confidence: 99%
“…Beam et al also developed an interesting method for the synthesis of substituted pyrazolobenzoxazinones 65 by cyclocondensation of hydrazones 53 with lithiated methyl salicylate 64. 29 The cyclic products 65 were formed after treatment of the reaction mixture with acid (Scheme 15, Table 9).…”
Section: Scheme 12 Synthesis Of Functionalized Pyrazolesmentioning
confidence: 99%
“…These electrophilic reagents presented a challenge because of the potential for diminished electrophilicity and reactivity of the carboxyl carbon, which is in a resonance position relative to the phenoxide ion portion of the electrophilic substrate (17)(18)(19). The condensation-cyclization of these trianion-type intermediates with lithiated methyl thiosalicylate (20) was not attempted at that time, and such an investigation offered the potential for the preparation of thiochromone-2-acetamides (N-aryl-4-oxo-4H-1-benzothiopyran-2-acetamides) that may be difficult to prepare by traditional procedures.…”
mentioning
confidence: 99%
“…One of our major strong-base multiple anion synthesis efforts has dealt with the preparation of 1H-pyrazoles and related compounds by the utilization of C(α), N-hydrazone (e.g., phenyl, benzoyl, carboalkoxy, etc.) entry compounds that were polylithiated with excess lithium diisopropylamide [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. The polylithiated intermediates were condensed with a variety of esters and other electrophilic reagents, followed by an acid cyclization of C-acylated intermediates that were not usually isolated.…”
mentioning
confidence: 99%